Centrifugal extractor



T. A. BRYSON ET AL csu'rauueu. EXTRACTOR Sept. 1, 1931. Re. 18,174

f I Original Filed llay 15, 1924 4 sheets-sheet 1+ INVDITORS J TA. rpm 0.4 Hum/ms BY i v I I T. A. BRYSON ET AL Sept. 1, 1931. Re. 18,174

GENTRIFUGAL EXTRACTOR s I Qrigmal File d Hair 15 1924 I 4 Sheets-Sheet 2 INVENTORS Z'A. Br :00 m/FI W/l/kms Y I V T. A. BRYSON ET AL 4 Sheets-Sheet 4,

Sept. 1, 1931.

csummuqn. EXTRACTOR Original Filed May 15, 1924 INVENIORS: fl Williams Reis'med Sept. 1', 1931 YUNITED STATES Re. 18,174 I PATENT OFFICE DANDY A. BBYSON AND FRANK I. WILLIAHB, OF TBOY,-HEW 2031:, 5881611038 TOLH UBST MACHINE WORKS, INC, A CORPORATION-OI NEW YORK Original No. 1,640,978, dated August 80, 1927, Serial No. 718,488, fled Kay 15, 1924. Application for reissue filed August 28, 1929.

Theinvention relates to safety devices for centrifugal extractors, and more particularly to a novel form of mechanism for preventing the starting of the machine until the cover is closed and for preventing the opening of the cover until the basket is absolutely at rest.

Objects and advantages of the invention will be set forth in part hereinafter and in part will be obvious herefrom, or may be learned by practice with the invention, the same being realized and attained by means of the instrumentalities and combinations pointed out in the appended claims. 1

.The invention consists in the novel parts, constructions, arrangements combinations and improvements herein shown and described. v

The accompanying drawings, referred to herein and constituting a part hereof, illustrate one embodiment of the invention, and together with the description, serve to explain the principles of the invention. 7

Of the drawings w Fig. 1 is a side elevation of a machine embod ing the invention;

Fig. 2 is a top plan corresponding to Fig. 1;

Fig. 3 is a fragmentary top plan corresponding to the right hand part of Fig. 2, but with the safety mechanism in a different position;

Fig. 4' is a fragmentary elevation corresponding to the upper right hand part of Fig. 1, but with the safety mechanism in a different position; V i

Fig. 5 is a fragmentary elevation looking at Figs. 1 and 2 from the right;

Fig. 6 is a fragmentary detail section taken substantially on the line 6-6 of Fig. 1, showing the safety. device in the running position;

Fig. 7 is a similar view to Fig.6, but show ing the safety device in the non-running position; and I Fig. 8 is an enlarged, sectional perspective view of a portion of the safety sleeve.

The invention is directed to a novel, simple and very eflicient safety mechanism for 1 centrifugal machines, which prevents starting of t e machine while the cover is open and prevents opening of the cover until the enclosed in a casing 2, whichis supptorted Serial No. 387,775.

machine has come absolutely to rest. Furthermore, the safety mechanism, in its pre-' ferred form, comprises members co-operating or interlocking directly together, one of which is movable directly with the basket cover and the other directly with the basket driving shaft.

The member movable with the drivingshaft must be given rotation relatively to the driving shaft and in the driving direction before t e basket cover can be opened. This insures that the cover cannot'be opened until the shaft is at rest, as practical experience driven centrifugal. The basket (not shown) which may be 0 any usual or suitable kind, is

on a hollow. base 3. The basket sha 4 is carried in a suitable bearing (not shown) and A It pulley 5 is fixedon' the shaft 4 and a driving belt 6 runs thereover. The belt 6 runs over suitable guiding pulleys 7 and 8, journaled res ively upon a supplortm'g bracket 9. The bracket 9 1s prefera pzojects downwardly within the base 3. I

ly designed and mounted totake up slack in the belt and for this purpose it is pivotally mounted at 10 upon a bracket 11, fixed to or integral with the base portion of the pedestal 3. The positioning means for the bracket 9 and its belt pulleys 7 and 8 comprises a screw 12, screw-threaded into a flange on the bracket 9, and having its point bearing upon preferably provided with a locking nut 14. The be fixed on a shaft 16 which is journaled in the horizontally disposed, U-shaped frame 17 which projects rearwardly horizontall from the casing 2, to which it 1s bolted. ere is preferably provided also a supporting stay 18, bolted at its top 'eud'to the outer transt 6 runs over a driven pulley 15,-

end 0 verse part of the frame 17 and at its bottom end to the lower artof the casin 2. Fixed to shaft 16 is a ast ulley 19 an journaled loosely thereon is a oosepulley 20.

A suitable belt shifter is rovided, and as embodied, it com rises a orizontally-disposed rod 28,1ong1tudinally slidable inapertures in supports 29 and 30, which supports project upwardlyare mounted upon, and

from, the frame 17.- Two elt-enga ing fingers 31 and 32 project downwardly rom the rod 28' to engage with, and to shift, the belt 33 in the usual manner. The actuating means for'the rod'28 comprises an arm 34 havin a pin-and-slot connection 35 with one the rod 28.

The arm 34 is fixed on a shaft 37, whichshaft is journaled in bearings. 38 and 39, formed on one side of the support 29 and is also journaled in a bracket arm 40,' ed to one of the side reaches of the frame 17. The

' shaft 37 has an actuating arm 41-'fixed there to, whereby the shaft may be rocked and the belt be thereby shifted to and fro between the fast and loose pulleys in the usual manner. a

Means are provided by the invention whereby eo-o ratin and interlockin devices, moun direc y on the driving shaft, and connected to and moving'with, the safety cover prevent the throwing on of the power, and thereby starting the basket into rotation,

-, until the safety cover is closed, and also vent the opening of the cover until the has come absolutely to rest.

bodied, the safety cover has brackets 51'and 52 extending therefrom and fixed thes aft 53as and lowered, and also so at the entire moveto a shaft 58, which is journaled at 54 and 55 in brackets fixed on the casing 2. The shaft 53 extends outwardly at one end, andhasfixed to its outer end an arm 56. The arm 56 has fixed to its outer end an inwardlyextendin pin 57, which pin-works in aslot 59 formed in a cam late 60. The cam plate 60 is mounted on shaft 53 by m us of an elongated slot 61 through which t e shaft 53 passes, whereby the cam plate has radial 'or,

substantially radial movement relative to the shaft 53.' a

Cam'plate 60has a safety finger 64 pro-' jecting outwardly therefrom, this finger .be-

mg also reciprocably mounted in an aperture in a guiding and supporting bracket 65, carried on a side reach of the frame 17. The 7 slot 59 in cam plate 60 is shaped (Figs. 1 and 4) so that the finger 64 will be moved to and fro a proximatel radially with reference to e safety cover 50 is raised ment in one direction occurs at the beginning of the opening movement of the safety cover and the entire movement in the opposite di-' rection occurs at the end of the closing movement of the safety cover. That is, the safety finger 64 will be moved to non-runmng position immediately that thIbpiii'xiQFdfthe safety cover is begun, and will remain at that position until just as the safety cover is completclyclosed. The maehine must be stop )cd and part 68 must be in proper position be ore safety finger 64 can be 'moved,or, rather, before the safety-cover can be raised.

The devices mounted upon the driving shaft 16 cooperating with the devices just described, comp 'ise a locking sleeve 68, having an outer part b9 of lesser diameter and an inner part 70 of reater diameter, adapted to pass alternative y into line with finger 64 to permit or prevent movement thereof. The

sleeve is preferably provided with a thin e 71 on the inner face thereof. The locking 5 eeve is'loosely mounted on the driving shaft 16 so as to have relative movementjboth along and about the shaft, to move the locking sleeve into and-out of locking position with respect to the finger 64, v v a The connections between the sleeve and shaft are such that the locking sleeve must be rotated relativel the direction of driving rotation of the shaft in order to move the sleeve from the safety locking position to the unlocking'position; As embodied, said means co rises a pin 72 fixed inshaft 16 and projectm "into an inclined or helical slot 73, forme in the inner cylindrical face of the locking sleeve 68. The direction of inclination of the slot 73 is such that when it is rotated in the direction of rota:

move inwardl along the shaft from the safety interloc ing position to the non-runnin position, or interlocking position.

eans are provided by the invention for insuring the interlocking action, and as embodied, said-means are constructed and arran ed so that the safety sleeve 68 is moved to t e interlocking is thrown on. In t e embodied form thereof, an arm 74 is fixed on shaft 37 (Fig. 5) so that as thebelt is thrown on, the safety sleeve 68' will be moved to the safety interlocking position. I

The operation of the mechanism just described is substantially-as follows The safety cover 50 may be regarded as in the raised or open position of F1 4 so that the basket may be loaded. It'wil be remembered that when the safety cover 50 is opened, the safety locking sleeve 68 must be 1n the inner position on shaft 16, and that it can moved inwardl along shaft 16- to this 1- tion (shown in igs. 3 and 4) only when ifft 16 is at rest.

When safety cover 50 is open, arm 56 is in the lower part of slot 59 (as shown in Fig, 4), and finger 64 is in its extreme outward position in line with the fiat side face of the ento the driving shaft 16 in tion whenever the belt tion of the shaft 16, the safety sleeve will Q larged part 70 ofv the safety. sleeve. The

finger thereby prevents the sleeve being moved to the running position, and thus prevents the slip ing of the belt fromthe loose to the fast u ley so long as the safety cover is open. at is finger 64 (Fig.. 5) prevents safety sleeve 68 being moved outwardly on shaft 16, and the belt cannot be shifted from the loose to the fast pulley unless arm 74 so moves safety sleeve 68. I When the safety cover is closed by the attendant, arm 56 is thereby swung along slot 59, which for the greater portion of its length is concentric with the arm 56, so that there is no motion of the cam plate 60 or of the'safety finger 64 Just as the cover 50 is about to close the pin 57 reaches the'upper, outwardly curved part of the cam slot 59 (Fig; 4), andthereby safety finger 64 is retracted out of the path of movement of the safety locking sleeve 68 'ust as the cover 50 closes.

he belt shifting lever 41 may now be rocked by hand, and thereby the bar 28 is moved longitudinally from left to right in Fig. 5, and the belt is shifted from'loose pulley to fast ulley 19 and the basket begins to rotate. y this same movement, the safety-locking sleeve'68 is moved outwardly along shaft 16, from the position of Fig. 3 to that of 1 and 2, and the enlarged peripheral part of the safety locking sleeve is moved 'into the path of the safety finger 64. Outward movementof the finger 64 is thereby prevented, and this revents opening of the safet cover 50. T iis safety interlocking -COIld1tl0ll continues so long as shaft 16 continues to rotate, for the reason that safety sleeve 68 can be moved back to a positionpermittin movement of finger 64 only by being rotate by hand about shaft 16 in the direction of rotation of the shaft, and this is impossible until sha-ft 16 comes to rest.

When the belt is'shifted again to the loose pulley, the basket does not necessarily come,

instantly to rest. The mechanism, however,

will not permit the opening of thecover until i the shaft 16 and the basket have come to a full stop. This is due to the fact, just above stated, that to move the safety-locking sleeve from the interlocking position of Fig. 2 to the free position of'Fig. 3, itis necessary to rotate the locking-sleeve on the shaft 16 in the direction of rotation of the shaft. -'This is donemanually by the attendant and practical experience has shown that it is impossible to do this so long as the shaft 16 continues to rotate.

Thus the machine cannot be starteduntil the safety cover is closed and the safety cover cannot be opened until the machine has come absolutely to rest.

The invention 111 its broader aspects is not limited to the specific mechanisms shown and described butdepartures may be made there-v from within the scope'of the accompanying claims without departing from the principles of the invention and without sacrificing its chief advantages. 4

What we claim is 1. A centrifugal extractor including in combination a basket, a drivin shaft,'a safety cover, a safety lock including a member reciprocably movable with the cover and a member rotating continuously with the shaft and being rotatable in the same direction relatively thereto whilethe shaft is station-' ary, said two members mutually locking each other for preventing the starting of the driving shaft unless the cover has been closed,

and for preventing the opening of the cover as long asthe driving shaft continues to ro tate.

2. A centrifugal extractor including in combination a basket,'a drivin shaft, a safety cover, a safety lock inclu ing a. member M reciprocably movable with the 'cover and a member mounted concentrically with and longitudinally movable on the shaft and rotating with it and being rotatable in the same direction relatively thereto only when the shaft is stationary, and controlling said first mentioned movable member.

3. A centrifugal extractor including in combination a'basket, a driving shaft, a safety cover, a safety lock including a member reciprocably movable with the cover anda member rotating with the shaft and being rotatable through'a limited arc in the same direction relatively thereto to pass out of the path of said first-mentioned member. 7 4.' A centrifugal extractor including in ,combination a basket, :1 driving shaft, a safety cover, a safety lock including a member movable with the cover and a-member rotating with the shaft and being rotatable in the same direction relatively thereto only when said shaft is stationary to pass out of the path of said first-mentioned member, and

means cooperating with said rotatable member for preventing starting of the shaft while the cover is open.

5. In combination with a centrifugal machine, an element movable with the cover of.

the centrifugal and positionable in locking and non-locking positions, a rotatable member positively driven b the driving mechanism of the centrifuga and positionable in locking and non-locking positions, said ele- .ment-and said member mutually interengagin for. preventing the starting of the machine unless the cover is closedand for preventng the opening mach ne has stopped.

6. In combination with a centrifugal machine, an element movable with the cover of the centrifugal and positionable in locking and nonlocking positions, a member rotated by the driving mechanism of the centrifugal and positionable in locking and non-locking positions, said member being movable to un locking position only when the driving mechanism is at rest by being rotated inthe same direction thatthe driving mechanism of the cover until the means,

. the centrifu al p ing. longitui 'n locking member .shaft unless t e structor is rotated, said element and said member mutually interengaging for preventing the start ing of the machine unless the cover is closed and for preventing the ope of the cover until the machine has stop v 7. In combination with a centrifugal machine, a shaft for driving the centrifugal, a locking member ke ed to said shaft to rotate therewith and ongitudinally movable thereon, a locking member connected to move with the cover of the centrifugal, said two locking members interengaging for mutually lockin each other, for reventin the starting of the driving sha when e cover is I open, and for preventing the opening of the cover while the shaftisrotating.

8. In combination with a centrifugal machine, a driving shaft, a locking sleeve,

including a key and a diagonal slo -.the sleeve on the shaft, an r movable with the cover of thelocking member revental movement ofthe s eeve on the shaft unless the cover is closed.

. 9. Incombination with acentrifugal machine, a driving shaft, a locking sleeve, means including a kc and a diagonal slot for positionin the s eeve on the shaft an for positioni a locking mem a locking mem r movable with the cover of the locking sleeve and the serving to lock each other for preventin the starting of the driving the centrifugal,

venting the o ning of the cover unless rotation of the riving shaft has ceased.

10. In a centrifugal machine havi a casirg and rotatable basket, the combination 0 a safety cover, means for drivin the ct, power-control means for re ating the driving means, including a' belt-shift lever, means for locking the cover in closed misition, and a longitudinally movable memr. controlled by the cover-locking means lfor blocking movement of thebelt-shift ever. I

11. In a centrifugal machine-hg a casing and rotatable basket, the combination of a safety cover, a shaft for driving the hascombination a b cover is closed and for prewhen the cover is open, and a member ley positively driven'bypthedri shaft for the obstructor when e shaft 1s r0 -13. cen extractor including in combination a i: t, a dri shaft, a safe ty cover, a safety lock mem a member movable with the cover' and means for preventing starting of the dri shaft until the. sa ety cover has been c135 comprising an obstructor mounted upon'and rotatin free] with the shaftin the path of s'ai mem r, said obstructor bei rotatable relatively to the shaftand in t tion to pass out of the path of said member. 14. A centrifu extractor including in et, a drivin shaft, asafety cover and a safetylock inc uding a member reci means or preventing starting of the drive same direcrocably movable with the cover and ing shaft until the safety cover has been closed comprisin an obstructor -mounted upon and positive y rotated bythe shaft in the path of said member, said obstructor being rotatable relatively. to the shaft and in the same direction to pass out of the path of said member. i

In testimony whereof, 'we have signed our names to this s ification.

'FZ NDY A. BRYSON.

FRANK I. WILLIAMS.

ket, power-contmhmeans therefor, an obfor preventing open of the cover when thefdriving shaft is rotating of the position of the power contro means,

said obstructor also operating to prevent application of power when the'coveris o the shaft and a'member podtivel driven the 'ving shaft for. y by engaging the. o ctor when isrota' 12. In a centri machine having a] safety mm, driving shaft for the basket having live and loose pulleys thereon, a belt 'fter, an obstructor for opening of the cover when the shaft is rotating regardless of the position of the belt shifter ma positioned in the path of .uii belt shifter toprevent movement thereof to the livt pul- 

